I recently found a really good piece of SS/HG fanfiction. It's still a work in progress, but so far, the story is fantastic.
Title: A Choice of Roads
Summary: (As written by the author) "A curious Hermione finds a way to see future visions of life with Harry or Ron. She didn't expect to see one with the dark Potions Master..."
Other: Written before HBP
You can find the fic here.
Hope to hear from some of you soon!